Forming Device

ABSTRACT

A forming device for reforming a material web into a tube, comprising a shoulder part with a shoulder surface and a prism part with a prism surface, wherein the shoulder surface and the prism surface are connected to one another along a spatial reforming edge, which has at least one reforming edge portion with a slight curvature and at least one reforming edge portion with a strong curvature, wherein in the prism part, at least in the region of a reforming edge portion with a strong curvature, an inner former element with an inner former surface facing the prism surface is arranged in such a manner that between the prism surface and the inner former surface, a gap which runs along the reforming edge is formed, the width of said gap being adjustable.

BACKGROUND AND FIELD

The invention relates to a forming device for creating a tube from amaterial web for form, fill and seal machines. In particular, theinvention relates to those kinds of forming devices which are designedto form tubular cross sections, the boundary lines of which exhibitlocally large changes in their curvature. This refers to boundary linesof a tubular cross section which, as in the case of a rectangular crosssection, for example, comprise multiple comparatively long, linearportions (the sides of the rectangle), which extend in differentdirections and are connected to one another by comparatively short,curved portions (the rounded corners of the rectangle).

A huge variety of generic forming devices for creating a tube from amaterial web are known in the art. These forming devices are used inpacking machines, which are also referred to as tubular bag machines orform, fill and seal machines, for reforming a planar, flexible materialweb into a tube. Depending on the running direction of the material webduring reforming, a distinction is made between vertical and horizontaltubular bag machines.

Vertical tubular bag machines are preferably used for packing bulkmaterial into tubular bags, whereas horizontal tubular bag machines areparticularly used in the packing of piece goods. The reforming of thematerial web from the planar into the tubular state is completed withinthe tubular bag machine on a forming device.

Some forming devices have a shoulder part with a shoulder surface onwhich the planar cross section of the material web is curved to beginwith, and a prism part with a prism surface on which the curved crosssection is reformed into a closed tubular cross section. The shouldersurface and the prism surface are connected to one another along aspatial reforming edge. The forming device may be a one-part ormulti-part spatial forming body made of solid, inflexible material whichis produced either from solid material or from sheet metal, usuallysteel or another material. Adjustable forming devices which are designedfor the production of different tubular cross sections may comprisemultiple forming elements, which each have only one portion of shouldersurface, reforming edge and prism surface, wherein linear reforming edgeportions, in particular, i.e. regions in which the boundary line of thetubular cross section being produced is linear, are not even physicallyrealized.

The packing material web is removed from a roll as a flat web andreformed into a tube by means of the forming device. The tube mayenclose a round, rectangular, or other convexly formed cross section.The geometry of the guiding surface of the forming shoulder, in otherwords the surface that comes into contact with the packing material web,should, where possible, be of such a size and spatial configuration thatevery material fiber of the packing material web covers the same pathduring reforming and the space between adjacent material fiberstransversely to the running direction remains constant, so that thepacking material web is neither stretched nor lengthened nor permanentlydeformed.

Particularly in the case of vertical forming devices for the productionof tubular bags, the tubular cross section located in the prism part isfrequently gravity-filled with packing material (frequently bulkmaterial) through a prismatic filler tube which projects in a verticaldirection into the prism part of the forming device. In the case ofhorizontal forming devices for the production of tubular bags, aprismatic filler tube which projects in a horizontal direction into theprism part of the forming device is sometimes used in a comparablemanner, in order to keep the part of the created tubular cross sectionlocated in the prism part open, while the packing material (frequentlypiece goods) is pushed into said cross section. In order for theholding-open of the tubular cross section to be reliably achieved, thefiller tube projects very far into the prism part in these cases, forexample 100 mm, 200 mm, or more. Both in the case of vertical and alsohorizontal forming devices, the filler tube is customarily of such asize that it is at a sufficient distance, for example 10 to 20 times thethickness of the material web, or more, from the prism surface and fromthe reforming edge of the forming device, so that the reforming andtransportation of the material web is not impeded or influenced in someother way. It follows from this that the reforming of the material webinto a tubular cross section is only caused by the reforming edge andthe filler tube itself is not involved in this tube formation.

Particularly in the field of horizontal tubular bag forming devices,significant improvements have been able to be achieved in the recentpast, which have led, among other things, to the forming devices beingadjustable and therefore universally useable, configured in a mannersuitable for cleaning, and, on account of an integrated data-processingdevice, being capable of adapting to a wide variety of applications, asa result of which it is possible for the highest qualities to beachieved.

WO 2019/123356 A1 describes a forming device for horizontal tubular bagmachines for creating a tube from a material web which can easily bemodified for the production of different bag cross sections. The formingdevice comprises a horizontal base plate which has a slot running in atransport direction, and also two shoulder parts fastened to the baseplate on either side of the slot, which shoulder parts each exhibit aportion of a reforming edge via which the material web is conducted forreforming, wherein the shoulder parts each comprise at least twoshoulder part segments detachably connected to one another, in whichtheir distance from one another can be set through the insertion of oneor multiple lengthening elements.

So that tubular cross sections with a different width and differentdepth can be produced easily and cost-effectively, WO 2020/058531 A1describes a forming device for creating a tube from a material web,having a first forming region in which the material web is guided from astraight web run-in to a reforming edge and is thereby reformed from aplanar into a curved state, a second reforming region attached to thefirst reforming region downstream, in which the material web is guidedfrom the reforming edge to a web run-out cross section, and in this caseis reformed from the curved into a tubular state, which comprises thefollowing: a base frame, two forming elements mounted movably on thebase frame alongside one another, transversely to the transportdirection of the material web, each having a reforming edge segment. Theforming elements each comprise a first partial element and a secondpartial element, wherein the second partial element strikes the firstpartial element in a minimal setting, and the second partial element isadjustable up to a maximum position in the direction of the reformingedge segment, creating a hole in the reforming edge which grows with thedistance from the first partial element.

Material webs made of a wide variety of materials are used to producetubular bags for packing purposes, depending on the intended use. So,for example, pure plastic films are used which may have a one-ply ormulti-ply design. Plastic films may, in addition, have a metalliccoating, for example aluminum. Composite materials may be based on paperas the carrier material, for example, and likewise coated with metaland/or with plastic in addition. Paper-based packing materials, inparticular, are currently experiencing a renaissance as a result of thecurrent trend towards sustainability and environmental protection.

All these different packing materials exhibit different behavior whenthey are reformed from a planar material web into a closed tubular crosssection. Hence, the tube forming device and the packing machine in whichthe tube forming device is installed have to be adapted to the currentlyused packing material in terms of the run-in angle of the material webinto the tube forming device, in terms of the web tension, and possiblyin terms of the web running speed, in such a way that the mostcrease-resistant forming possible is guaranteed and there is no foldingor even tearing of the material web. It has been demonstrated that manypaper-based packing materials are particularly difficult to process whenthe tubular cross section exhibits portions with a sharp curvature.

Based on this prior art, a problem addressed by the present invention isthat of developing known forming devices for the creation of a tube froma material web, in particular horizontal forming devices of this kindfor packing piece goods, in such a manner that they allow the productionof tubular cross sections with a greatly varying curvature of theboundary line of the tubular cross section in a simple andcost-effective way.

These problems are solved by a forming device having the features ofpatent claim 1. Advantageous embodiments and developments are describedin the dependent patent claims.

The proposed reforming device may be designed in accordance with one orseveral of the aspects described above. For clarification, these aspectsare described with reference to the drawing figures, in which several ofthese aspects are realized. Each of these aspects is claimed bothseparately and also in any combination.

SUMMARY

In order to solve the problem, a forming device for reforming a materialweb into a tube is proposed, which comprises a shoulder part with ashoulder surface on which the planar cross section of the material webis initially curved, and a prism part with a prism surface on which thecurved cross section is reformed into a closed tubular cross section,wherein the shoulder surface and the prism surface are connected to oneanother along a spatial reforming edge which has at least one reformingedge portion with a slight curvature and at least one reforming edgeportion with a strong curvature, wherein in the prism part, at least inthe region of a reforming edge portion with a strong curvature, an innerformer element with an inner former surface facing the reforming edgeand the prism surface is arranged in such a manner that between theprism surface and the inner former surface, a gap which runs along thereforming edge is formed, the width of said gap being adjustable.

The gap width in this case represents the perpendicular distance of theinner former surface from the prism surface and therefore from thereforming edge. The gap is therefore sufficiently large for the materialweb to be allowed to pass through without becoming trapped or otherwisehindered in its movement. The inner former element in this case helpsguarantee a precise and crease-free reforming, in that the packingmaterial is helped by the action of the inner former surface in thiscase to fit snugly in the reforming edge region with a strong curvature.

In one embodiment of the proposed forming device, it is provided thatthe inner former element is movably arranged relative to the reformingedge, so that the gap width between two characteristic positions whichrepresent a maximum gap width (e.g. as the maintenance position forremoving a jam or for introducing a new material web) and a minimal gapwidth (e.g. as the working position for the thinnest material web thatcan be processed using the forming device) is adjustable.

In an advantageous development, the proposed forming device isconfigured in such a manner that the inner former element can be fixedbetween the two characteristic positions referred to above in at leastone intermediate position, for example in one of multiple intermediatepositions. The inner former element in this case may either be fixed inany intermediate position or the forming device is configured in such amanner that it has multiple discrete intermediate positions, for examplein that screening is provided which defines the intermediate positionsin which the inner former element can be fixed.

The movement in this case can take place in a different way. Forexample, the inner former element can be moved perpendicularly to alongitudinal extent of the prism part, i.e. directly towards the prismsurface or away from the prism surface. This means that in order toincrease the gap width, the inner former element is moved into thechannel formed by the prism surface, said channel being needed for theintroduction of the piece goods into the tubular cross section formed.According to a development, it may be provided that the inner formerelement is movable in this direction and at the same time is flexiblymounted, for example against the force of a return spring. It is therebyachieved that the setting of the gap width takes place as needed andautomatically, as it were, in that the material web displaces the innerformer element to the center of the tubular cross section when theforming forces become so great that, despite help from the inner formerelement, the material web is no longer able to fit snugly in a reformingedge region with a strong curvature, for example because the thicknessof the material web fluctuates and a point with a greater thicknesspasses the reforming edge. Once this thicker point of the material haspassed the gap, the inner former element is moved back by the flexiblebearing, for example a return spring, into its original position.

Under certain circumstances, an embodiment of this kind in which theinner former element is movable perpendicularly to a longitudinal extentof the prism part may be unfavorable, specifically if the movementdirection of the inner former element means that the introduction ofpiece goods into the tubular cross section is impeded. For this reason,according to another embodiment of the proposed device, it is proposedthat the inner former surface forms an acute angle with the prismsurface relative to a longitudinal axis of the prism surface, and theinner former element is movable in the direction of the longitudinalaxis. In this embodiment, the inner former element may be moved back andforth, in order to increasing or reducing the size of the gap betweenthe inner former surface and the reforming edge in the transportdirection of the packing material, and therefore parallel to alongitudinal axis of the prism part.

In a particularly advantageous embodiment it is provided that the innerformer element, in addition to the movement of the packing pieces in thetransport direction, which brings about an adjustment of the gap widthof the gap formed between the inner former surface and the reformingedge, in a similar way to that described above, is flexibly mountedperpendicularly thereto, for example against the force of a returnspring, in order to allow a temporary adjustment of the gap width in theevent of fluctuating reforming forces, for example due to fluctuatingmaterial thickness of the material web.

In an advantageous embodiment of the proposed forming device, it isprovided that each inner former element is operatively connected to anactuator, in order to generate movement relative to the reforming edge.In this way, it is possible for the movement of the inner former elementto be automated, so that manual interventions are avoided. Actuators ofthis kind may be designed as an electromotive spindle drive, pneumaticcylinder, or the like, for example, and are particularly advantageouslyactuated by a machine controller of a packing machine.

Furthermore, in the case of the proposed forming device, it may beprovided that the reforming edge has at least two reforming edgeportions with a strong curvature, wherein an inner former element has aninner former surface extending over the at least two reforming edgeportions. An example of this is a forming device which is designed toproduce a rectangular tubular cross section, wherein the run-in materialweb faces a straight reforming edge portion, at each of the two ends ofwhich a reforming edge portion with a strong curvature is located. Aninner former element in the aforementioned sense may have an innerformer surface, for example, which extends both over the straightreforming edge portion and over the two adjacent reforming edge portionswith a strong curvature, so that the material web in this entire regionis guided and supported between the inner former surface and reformingedge.

Alternatively or in addition, it may be provided in the case of theproposed forming device that it comprises at least two forming elementswhich are movable relative to one another for adjusting the tubularcross section being produced, said forming elements each having areforming edge portion with a strong curvature, wherein in the region ofthe reforming edge portion with a strong curvature of each formingelement, an inner former element which is movement-coupled with theforming element is arranged.

Two things are achieved by this embodiment. On the one hand, theassociated inner former element is synchronously carried along with eachforming element when the forming device is adjusted for production ofanother tubular cross section. On the other hand, the inner formerelement remains movable relative to the forming element, in order toadjust the gap width, so to increase the gap to the maximum possibleextent, for example, when a new material web has to be introduced or thegap width adapted to a thicker or thinner material of the packingmaterial web.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in greater detail below with the help ofexemplary embodiments and associated drawing figures. In the drawings

FIG. 1 shows a forming device according to the invention with innerformer elements by comparison with a state-of-the-art forming devicewith a filler tube;

FIG. 2 shows a forming device of the proposed kind according to a firstexemplary embodiment in a perspective view;

FIG. 3 shows a side view of the forming device according to FIG. 2 withthe inner former elements in two characteristic positions;

FIG. 4 shows the characteristic positions of the inner former elementsof the forming device from FIGS. 2 and 3 as a perspective view;

FIG. 5 shows geometric relations in a first characteristic position(working position),

FIG. 6 shows geometric relations in a second characteristic position(maintenance position),

FIG. 7 shows a forming device of the proposed kind according to a secondexemplary embodiment as a perspective view;

FIG. 8 shows a perspective detail view of the forming device accordingto FIG. 5;

FIG. 9 shows the characteristic positions of the inner former elementsof the forming device from FIGS. 5 and 6 as a perspective view;

FIG. 10 shows examples of possible embodiments of the inner formerelements.

DETAILED DESCRIPTION

FIG. 1 represents in the upper drawing FIG. 1A a forming element 12 of aforming device 1 according to the invention with an inner former element5. For comparison, the lower drawing FIG. 1B shows a forming element 12of a state-of-the-art forming device 1 known per se with a filler tube 8which projects horizontally by the amount F into the prism part of theforming device 1, so that the tubular cross section is kept open whilethe tube is filled with the packing material, i.e. in order to preventthe tubular cross section from collapsing. A direct comparison betweenthe drawing FIGS. 1A and 1B with one another shows that the inner formerelement 5 does not project into the tubular cross section, but only hasa direct geometric operative relationship with the reforming edge 4 ofthe forming element 12, in that a comparatively narrow gap remainsbetween the inner former element 5 and the reforming edge 4, the gapwidth of which is only approx. two to three times the thickness of thematerial web in the exemplary embodiment, as a result of which thereforming of the material web into a closed cross section by thereforming edge 4 and the inner former element 5 is carried out jointly.According to the arrangement of the inner former element 5 relative tothe forming element 12, this effect is found, in particular, in thereforming edge portion with a strong curvature 42, in which the innerformer surface 51 of the inner former element 5 is arranged relative tothe reforming edge 4.

The forming device is configured in such a manner that it is designedfor producing a rectangular tubular cross section. The reforming edge 4therefore has reforming edge portions with a slight curvature 41 andreforming edge portions with a strong curvature 42. The inner formerelements 5 in this case are arranged in such a manner, and their innerformer surfaces 51 are formed in such a manner, that they follow thecontour of the reforming edge 4 in the region of the corners of thetubular cross section, and therefore in reforming edge portions with astrong curvature 42, so that they act jointly with the reforming edge 4to reform the material web guided through between them. The inner formerelements 5 are movably arranged relative to the reforming edge 4 in sucha manner that the gap width between the inner former surface 51 and thereforming edge 4 is adjustable. This is achieved in that the innerformer surface 51 forms an acute angle α with the prism surface of theforming device relative to a longitudinal axis of the prism surface,i.e. the transport direction of the packing material, and the innerformer element 5 is movable in the direction of this longitudinal axis.Through this configuration, the adjusting range ΔA of the inner formerelement 5 in the transport direction of the packing material is alwaysgreater than the change ΔG in the gap width between the inner formersurface 5 and the reforming edge 4 which it causes:

ΔA=ΔG/sin α

FIGS. 2 to 6 show in different representations an overall view of afirst exemplary embodiment of a forming device 1 of the proposed kind asa perspective view, the forming device with two characteristic positionsof the inner former elements in side view and in perspective view, andthe geometric relations on the forming device in both characteristicpositions. Two forming elements 12, which are formed in such a mannerthat a material web guided over them is reformed into a tubular crosssection, are arranged on a base plate 11. Lying on the base plate 11,items which are to be packed can be pushed into the formed tubular crosssection. Before the start of the reforming region, front guide elementsare therefore arranged on the base plate 11, which guide elements limitthe transport path of the items being packed. Rear guide elements 13 arearranged on the base plate 11 behind the two forming elements 12, saidguide elements guiding the finally packed items along the transportpath. Viewed in the transport direction, two inner former elements 5 arearranged between the front guide elements 13 and the two formingelements 12, each an inner former element having an inner former surface51 facing the reforming edge 4. Each of the two inner former elements 5is mounted so as to be movable in the transport direction of the itemsbeing packed in a longitudinal hole in the base plate 11 and can befixed in a desired position by means of a screw. In order to introduce amaterial web into the forming device, the inner former elements 5 can bemoved manually into a characteristic position in which the gap width hasa maximum dimension between the inner former surface 51 and thereforming edge 4 in each case. If this is achieved, the inner formerelements 5 can likewise be moved into a second characteristic positionmanually and fixed, in which position the inner former surface 51 comesinto a spatial relationship and operative connection with the reformingedge 4, which guides and conducts the material web, in particular inreforming edge regions with a strong curvature 42, and in this waycontributes directly to the reforming of the material web into a tubularcross section.

FIGS. 5 and 6 show in various views the geometric relations at theproposed forming device. In FIG. 5 the inner former element 5 is locatedin a characteristic position, which is a working position. The adjustingrange A1 of the inner former element 5 is maximal here, relative to theguide element 13. The gap width G1 in this position is minimal, so thatthe contribution of the inner former element 5 to the reforming of thematerial web into a tubular cross section is maximal. The inner formerelement 5 is in a characteristic position in FIG. 6 which is amaintenance position. The adjusting range A2 of the inner former element5 is minimal here, relative to the guide element 13. The gap width G2 ismaximal in this position, meaning that the contribution of the innerformer element 5 to the reforming of the material web into a tubularcross section is minimal, unless this gap width has been chosen becausea thicker material web is being processed, which requires acorrespondingly greater gap width.

FIGS. 7 to 9 show in different representations an overall view of asecond exemplary embodiment of a forming device 1 of the proposed kindas a perspective view, a perspective detail view of the forming device,and the characteristic positions of the inner former elements of theforming device as a perspective view. Two forming elements 12 which areformed in such a manner that a material web 7 guided over them isreformed into a tubular cross section are arranged on a base plate 11.Lying on the base plate 11, items which are to be packed can be pushedinto the formed tubular cross section. Before the start of the reformingregion, front guide elements 13 are therefore arranged on the base plate11, which guide plates limit the transport path of the items beingpacked. Rear guide elements 13 are arranged on the base plate 11 behindthe two forming elements 12, said guide elements guiding the finallypacked items along the transport path. Viewed in the transportdirection, two inner former elements 5 are arranged on the base plate 11between the front guide elements 13 and the two forming elements 12,each inner former element having an inner former surface 51 facing thereforming edge 4. Each of the two inner former elements 5 is mounted soas to be movable in the transport direction of the items being packed inan elongate hole in the base plate 11. Two actuators 6 are arranged onthe underside of the base plate 11 which are each operatively connectedto one of the two inner former elements 5 in such a manner that theinner former elements 5 can be moved towards, or away from, thereforming edge, and can be thereby be fixed in a desired position. It istherefore possible for each inner former element 5 to move to and fixthe desired characteristic position without manual intervention, forexample determined by a machine controller.

FIG. 10 shows four examples of possible embodiments of the inner formerelements 5, and also of the shape and arrangement of the inner formersurfaces 51 thereof relative to the forming elements 12 and thereforming edge 4. The upper representation 10A shows in side view theviewing direction C and a plane of intersection D, which has beenapplied to the lower representations 10B to 10E, in order to explainpossible configurations of inner former elements 5. Depictedschematically therein are the base plate 11 and the two forming elements12, which are jointly configured to produce a rectangular tubular crosssection, which are composed of reforming edge portions with a slightcurvature 41 and reforming edge portions with a strong curvature 42. Theembodiment according to the representation 10B corresponds to the formand arrangement of the inner former elements 5 of the exemplaryembodiments already explained in FIGS. 2 to 6 and 7 to 9, in which twoinner former elements 5 each extend along a reforming edge portion witha strong curvature 42 in the upper half of the tubular cross section. Analternative embodiment is depicted in representation 10C, in which aninner former element 5 has an inner former surface 51 which extends inthe upper half of the tubular cross section over two corner regions withreforming edge portions with a strong curvature 42 and also a reformingedge portion with a slight curvature 41 arranged therebetween. A furtheralternative embodiment is shown in representation 10D, in which eachinner former element 5 has an inner former surface 51, which extend in alateral region of the tubular cross section in each case over two cornerregions with reforming edge portions with a strong curvature 42 and alsoa reforming edge portion with a small curvature 41 arrangedtherebetween. Another alternative embodiment is shown in depiction 10E,in which two inner former elements 5, each with an inner former surface51, extend along a reforming edge portion with a strong curvature 42 ineach case in the upper half of the tubular cross section.

LIST OF REFERENCE SIGNS

-   1 forming device-   11 base plate-   12 forming element-   13 guide element-   2 shoulder surface-   3 prism surface-   4 reforming edge-   41 reforming edge portion with slight curvature-   42 reforming edge portion with strong curvature-   5 inner former element-   51 inner former surface-   6 actuator-   7 material web-   8 filler tube-   A adjusting range of the inner former element-   A1, A2 characteristic positions of the inner former element-   G gap width-   G1, G2 gap width in a characteristic position

1. A forming device for reforming a material web into a tube, comprisinga shoulder part with a shoulder surface and a prism part with a prismsurface, wherein the shoulder surface and the prism surface areconnected to one another along a spatial reforming edge, which has atleast one reforming edge portion with a slight curvature and at leastone reforming edge portion with a strong curvature, wherein in the prismpart, at least in the region of a reforming edge portion with a strongcurvature, an inner former element with an inner former surface facingthe prism surface is arranged in such a manner that between the prismsurface and the inner former surface, a gap which runs along thereforming edge is formed, the width of said gap being adjustable.
 2. Theforming device as claimed in claim 1, wherein the inner former elementis movably mounted perpendicularly to a longitudinal axis of the prismsurface.
 3. The forming device as claimed in claim 2, wherein the innerformer element is flexibly mounted perpendicularly to the longitudinalaxis of the prism surface.
 4. The forming device as claimed in claim 1,wherein the inner former element is movably mounted in the direction ofa longitudinal axis of the prism surface.
 5. The forming device asclaimed in claim 4, wherein the inner former element is flexibly mountedperpendicularly to the longitudinal axis of the prism surface.
 6. Theforming device as claimed in claim 3, wherein the inner former surfaceforms an acute angle α with the longitudinal axis of the prism surface.7. The forming device as claimed in claim 1, wherein the inner formerelement can be fixed in at least two characteristic positions, whichrepresent a minimal gap width and a maximal gap width.
 8. The formingdevice as claimed in claim 7, wherein the inner former element can befixed between the characteristic positions in at least one intermediateposition.
 9. The forming device as claimed in claim 8, wherein the innerformer element can be fixed in any intermediate position.
 10. Theforming device as claimed in claim 8, wherein the inner former elementcan be fixed in one of multiple discrete intermediate positions.
 11. Theforming device as claimed in claim 8, wherein screening is providedwhich defines the intermediate positions.
 12. The forming device asclaimed in claim 1, wherein each inner former element is operativelyconnected to an actuator, in order to generate movement relative to thereforming edge.
 13. The forming device as claimed in claim 1, whereinthe reforming edge has at least two reforming edge portions with astrong curvature, wherein an inner former element has an inner formersurface extending over the at least two reforming edge portions with astrong curvature.
 14. The forming device as claimed in one of claims 1to 13, which comprises at least two forming elements which are movablerelative to one another for adjusting the tubular cross section beingproduced, said forming elements each having a reforming edge portionwith a strong curvature, wherein in the region of the reforming edgeportion with a strong curvature of each forming element, an inner formerelement which is movement-coupled with the forming element is arranged.